By Products & Grading of Cotton

After picking, cotton is sent to gin where the seeds are separated and the fibers are pressed into the 500 pounded forces, ready for sale. The long fibers separated by ginning shall be used for textile manufacturing. These long fibers are called lint. The very short fibers (0.25 inch)) remain with the seed are called linters and used in the manufacturing of human-made cellulosic/regenerated cellulosic fibers e.g. viscose rayon, coprammonium, acatate triacetate, tect. However, there are some byproducts of cotton as below:

·        Seed: used in making oils and the residues are used in making soaps, glycerin, etc.

·        Hulls: used in making fertilizers and paper.

·        Linters: Used in rayon and acetate production, film and plastic production as well as in bank notes manufacturing. It is also used in making blanket, gauge and in pillow.

Grading of Cotton:

In order to grade the quality of raw cotton, the rating (in the order of excellent to poor) is done according to the level of the length, strength, color, luster and impurities of the fibers. These are divided in different ways according to the production land.

Fibers are classified according to their quality. The classification of fibers is called grading. The grading is done basing on the following three factors:

1.     Color

2.     Foreign matters

3.     Preparation of the fibers.

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